My name is Rainbow Dash and today I learned something new. I learned I'm actually a changeling. You'd think that would be something you would already know. I just learned it now when I saw my true self for the first time. How did I come to replace the real Rainbow Dash, and when? And why can't I remember it?

Octavia Philharmonica is a desperate mare. Her involvement in the ill-fated "pony pokey" at the prestigious Grand Galloping Gala has left her blacklisted among the elite of Canterlot who form her clientele. Faced with the possibility of being evicted from her apartment for inability to pay rent she decides to take a temporary job at a local nightclub. Of course, she's never set hoof in a club before and has no idea what she's getting involved in . . .